noun
: an American fern ( Osmunda claytoniana ) with tall erect pinnate fronds and a few pairs of sporogenous pinnae borne at or near the center of the fertile fronds
noun
: an American fern ( Osmunda claytoniana ) with tall erect pinnate fronds and a few pairs of sporogenous pinnae borne at or near the center of the fertile fronds
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012